chore: fix kokoro config for samples (#55)

Source-Link: googleapis/synthtool@dd05f9d Post-Processor: gcr.io/repo-automation-bots/owlbot-python:latest@sha256:aea14a583128771ae8aefa364e1652f3c56070168ef31beb203534222d842b8b

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
  image: gcr.io/repo-automation-bots/owlbot-python:latest
- digest: sha256:6186535cbdbf6b9fe61f00294929221d060634dae4a0795c1cefdbc995b2d605
+ digest: sha256:aea14a583128771ae8aefa364e1652f3c56070168ef31beb203534222d842b8b

.kokoro/samples/python3.6/periodic-head.cfg

@@ -7,5 +7,5 @@ env_vars: {
 
 env_vars: {
  key: "TRAMPOLINE_BUILD_FILE"
- value: "github/python-pubsub/.kokoro/test-samples-against-head.sh"
+ value: "github/python-managed-identities/.kokoro/test-samples-against-head.sh"
 }

.kokoro/samples/python3.7/periodic-head.cfg

@@ -7,5 +7,5 @@ env_vars: {
 
 env_vars: {
  key: "TRAMPOLINE_BUILD_FILE"
- value: "github/python-pubsub/.kokoro/test-samples-against-head.sh"
+ value: "github/python-managed-identities/.kokoro/test-samples-against-head.sh"
 }

.kokoro/samples/python3.8/periodic-head.cfg

@@ -7,5 +7,5 @@ env_vars: {
 
 env_vars: {
  key: "TRAMPOLINE_BUILD_FILE"
- value: "github/python-pubsub/.kokoro/test-samples-against-head.sh"
+ value: "github/python-managed-identities/.kokoro/test-samples-against-head.sh"
 }

.kokoro/samples/python3.9/periodic-head.cfg

@@ -7,5 +7,5 @@ env_vars: {
 
 env_vars: {
  key: "TRAMPOLINE_BUILD_FILE"
- value: "github/python-pubsub/.kokoro/test-samples-against-head.sh"
+ value: "github/python-managed-identities/.kokoro/test-samples-against-head.sh"
 }